What Forces Act on a Descending Cylinder Attached to a Tape?

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SUMMARY

The discussion focuses on the forces acting on a descending cylinder attached to a tape. Key forces identified include the tension in the tape and the gravitational force acting on the cylinder. The moment of inertia for the cylinder is specified as 1/2MR², which is crucial for understanding the dynamics involved. The primary inquiry is to clarify the direction and application of these forces, emphasizing that only forces, not torques, are relevant to the question posed.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with the concept of tension in strings
  • Knowledge of moment of inertia, specifically for a uniform solid cylinder
  • Basic principles of rotational dynamics
NEXT STEPS
  • Study the application of Newton's second law to rotational motion
  • Learn about the relationship between linear acceleration and angular acceleration
  • Explore the concept of torque and its effects on rotational systems
  • Investigate the dynamics of systems involving pulleys and tension forces
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in mechanics, particularly those studying rotational dynamics and forces in systems involving pulleys and tapes.

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Homework Statement



A cloth tape is wound around the outside of a uniform solid cylinder (mass M, radius R) and fastened to the ceiling as shown in the diagram below. They cylinder is held with the tape vertical and then released from rest. as the cylinder descends, it unwinds from the tape without slipping. The moment of inertia of a uniform solid cylinder about its center is 1/2MR^2.

diagram: http://imgur.com/h0v07

what are the forces acting on the cylinder?

Homework Equations




The Attempt at a Solution



http://imgur.com/eyjPP

so far I'm pretty sure there should be tension in the tape, force of gravity, some torque and (mv^2)/r but I have no clue which directions they should go if they even apply
 
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The question is asking about only forces, not torques.
 

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